When \(V^2>0\)  , the \(\lbrace 6j\rbrace \) -symbol represents a tetrahedron embedded in the 3D Euclidean space. It reads [1]}
\(\left\lbrace \begin{array}{ccc}j_1 & j_2 & j_3 \\j_4 & j_5 & j_6\end{array}\right\rbrace \sim \frac{1}{\sqrt{12\pi V}}\cos \left( \sum _{l=1}^6 \ell _l \Theta _l + \frac{\pi }{4} \right) \,,\) 
